3251 + 587 + 369 -? = 3007

 538 x? = 3497

38.5 ÷ 5.5 x 12 - 4 =?

In a certain code DENIAL is written as MDCMBJ. How is SOURCE written in that code?

367.85 ÷ 22.95 × 14.93 =?

75%of a number is equal to four-fifth of another number. What is the ratio between first numberand the second number?